<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>demo 2-26</title>
	</head>
	<body>
	</body>
	<script>
		let a=Array();
		let b=Array(3);
		let c=Array(3,11,8);
		console.log(a);
		console.log(b);
		console.log(c);
	</script>
</html>